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The Linux kernel configuration item CONFIG_X86_X2APIC
:
CONFIG_X86_LOCAL_APIC && CONFIG_X86_64 && ( CONFIG_IRQ_REMAP || CONFIG_HYPERVISOR_GUEST )
This enables x2apic support on CPUs that have this feature.
This allows 32-bit apic IDs (so it can support very large systems), and accesses the local apic via MSRs not via mmio.
If you don't know what to do here, say N.
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